Air-brake system and automatic-releasing valve therefor



June 5, 1928.

L. S. QUATES AIR BRAKE SYSTEM AND AUTOMATIC RELEASING VALVE THEREFOR Filed June 28, 192"! 5 Sheets-Sheet 1 Qtfls June 5, 1928.

L. S. QUATES AIR BRAKE SYSTEM AND AUTO MATIC RELEASING VALVE THEREFOR Filed June'za, v192'? 5 Sheets-Sheet 2 June 5, 1928.

L. S. QUATES AIR BRAKE SYSTEM AND AUTOMATIC RELEASING VALVE THEREFOR Patented June 5, 1928.

.tiiq reee ene ie 9 eqmeiw AieAB M EAB BAKEYSTEEM AND AUTOMA-{IIC-REJQEASING VALVE anemone .rApplication'ifiledi June 28, 4927'. uSe rialNm r202 q87.

This invention relates toviair brake systems and to automatic releasing, Valves and associated mechanism utlie'refolg and more particularly to such Valves as; areused ,in connection with the air; brake System for railroad cars.

An object of the invention is ,tokprovide in my priorapplication forautoinatic releasvalw eifor air bralie systems-filed; September 19, 1923, .SerialfNo.- 6i63,605, allowed January '24,: 1927, and inore. particiilarly'lin the holding and releasing mechanism thereof.

Further object of the invention isto'pro-.

vi'de'a novelautornatie releasing Valve me.ch-' EJ115111 for air brake systems on railroadcars which ivill be positive in operation to re- 'lease the air brakes -shouldtheystick, and

0 which isontrolled zfroni the engineers cab and operated through the air or ltrzunhne and piping systein ef the various carswhich serves to set tlle brakes so'that the same is under positlvejcontrol of the engineer at all times, and may be released Without re-= quiring thedn'a'nual" release of the brakes by traininen traveling along the length of a train'of cars'fan'd Wliich'fis so constructed that the brakes may be released positively 0 and instantly frorri the en'gineers-cahin or locomotive;

Still'furtherobjects of 7 provide a reliefor release Valve which is operated increasing the pressure the engineer ubjecting the train line pipe to a' pressure @1390 pounds orp subs'tantiafly'such as distinguishedfroin and abovethe normal pressure which is usually about :70 pounds so to aetiiat'e the, release meehanisin' and through the triple valve ineeha'ni'sin; to open the release valve forperniittingthe spring 'aetuat'ed "lorake cylinder [piston to 'be "moved to a released position should the brakes stick byble'eding the air'pressure' from the brake cylinder, and the, reservoir thereof but for a short period only; so as not tomate'rially drain the air brake system below normal Qprfe sfsuresuoh as would subject the brake ap-' plying, syste n'to nnecessar Wear and tear.

Another object of the invention is to pro a releasingps'yste rn actuated fro ln the air line ii hich serves 'to' disengage or release a locking or' holding deviee'ior which consti- .tutes"a trip forreleasing a Valve actuating ne-ans, preferablj 'jop'erated. a spring' -so the irwention-is (to Vide a breali relea'fs ing system which includesvmannerenotlikely to get [out of wgr;king. or- ;der. as, well as' being thorough y p actic l and efiicient in v operationras iWlhfiS ;;in

- .manHfacture and lfcapable, of; being read y assen'ibled as Well. as 7 positive in use.

-With theiabovej-andiother objectskin yiew, e .ltihe invention consistsiin 'eert-ain HOVGIfiCOIIlwbinationsf and arrangements .of, pantsv .t-o ;;be

hereinafter more particularly set fonthfland Sdescribed. e v f v f i 211i the aeoompanyingkdrawings:

Figure.;1- i'sx'asideeelev-ation partlybloken away and in sectiQnLshowi-ng. onexform of automatic releasing idevice for air brake sysvitems and showing therparts .in the. position when the brakes arireleased." I

Figure 12 is an ienlarge'd seotional ;view ,of

the releasing device proper" taken-Jon the plane of the section line 2-72 of; Figure 3.

-F igureul is a sctionaliview taken onthe section lines 3 3 of Figures. '1" and 2.

Figure 4:1lS aside. elevation showing another 'fonnof releasingedevlce.

;,Figure u 5 I is la 5 sectional l elevation of tho device shown in Figure ,4, Figure4 eliciting the device When the brakes; are .Lreleased iand Figure 5 showing the position of Lithe part when the brakes areset. v-

' Flgure 6 is an nenlar edsectional. mew

partly in elevation of t e releasing-device fproperfi the' releasing .Valve for. relief ;valve -..omitted and the parts in a releasing position-as distinguished lfrom. the holding position shown in' FigureLG. I

Fieure 8 is a section eyiewrtaken on .the

nnei BofFigureG. I i

teeming to ethemdrawingssin,;detail, in which similar reference charaeters designate eorresp'ondingparts thrciughoirtthe several views; 1 -,designatessthestltainHor -air line pipe f to hichais,xioniieeteda gros iomrapipe 25 the ioppe i valve ewhich "isbmounted gn lorjeep, 945 the {Figurai' isa .viewsimilar tOiEigureGWith valve 3 through pivotally mounted thereon,

' to which pin as indicated at v27 by a clamp 28 and from one side thereof for relieving the pressure therein. Operating in the cylinder 5 is i a piston 9, this being the usual brake cylinder piston having the piston rod projecting through its cap or head end 11 and con.- nected by a fork at the point .12 in any suitable manner with the usual brake means not shown. The piston 9 is adapted to slide in the cylinder 5 and is held forward by an expansible coil spring 13 when. the piston is relieved of pressure adapted to pass through the induction pipe 7 leading from the triple auxiliary reservoir 4 and into cylinder chamher 5.

All of this structure is supported from the body or framing of the car designated at 14 which may be an I or channel beam by means of a bracket 15 to which it is bolted or otherwise connected as indicated at 16 so as to be suspended vertically therebeneath. The lower end of the bracket 15 has a flange 17 to which the cylinder 5 is bolted and indicated at 18 and arranged thereon is a release cylinder 19 having depending extensions 20 bolted to the cylinder 5 as indicated at 21. A pipe air pipe 1. with one end of the cylinder 19 in which a piston 23 is adapted to slide against the action of a spring 24 tending to hold it normally outward at the remote end. of the cylinder 19 from that to which the pipe 22 is connected and; the piston rod 24 of the piston 23 extends inwardly and has a trip or obtuse angled bell crank 25 for a purpose to be hereinafter explained. Connected to the piston rod 10 is an angular arm 26 which is clamped to the end of the piston rod 10 the forked end 12 is coupled by a bolted indicated at 29, the arm 26 extending upwardly and then forwardly as indicated, at 30 through a tubular slide or guide member 31 which is in the form of a bracket having oppositely extended aper- 1 tured ears bolted to the bracket 15 as indicated at 32 so that the forward end thereof is positioned over the cylinder 19 in position to engage the actuating mechanism now to be described.

Mounted upon the auxiliary reservoir 4 by a suitable boss 33 formed thereon is an the remote end of the 22 connects the brake line or I angular bracket 34 bolted as indicated at 35 and having the upstanding part 36 thereof formed with a forward projection 37 and and has its free end pivotally connected as at to a forked or bifurcated apertured end 46 providing ears for this purpose and con' stituting a toggle joint in connection with a link 47 for a relief valve 48 mounted on the a top of the auxiliary reservoir 4 and communicating interiorly therewi h. The relief valve may have the usual threaded stem 1nserted in a threaded aperture in the auxiliary reservoir for this purpose, and has a seat 49 5s internally against which a valve 50 engages under the action of a coil spring 51, the valve being preferably composed of two sections with reference to its casing threadedly connected as indicated at 52 to facilitate assemblage, repair or adjustment of the parts. The valve 48 is also provided with a bleed duct or port 53 in one side and the stem 7 54 of the valve projects upwardly between opposite pairs of spaced ears or bifurcations 55 so as to be engaged by the flat inner ends 56 of the angular link47 as more particularly shown in Figure 6 of the drawings and the latter adapted to lit over the corresponding end of a link 57 also pivoted to the valve 48 between the ears at the opposite side with respect to the pivotingof the link 47 and connected to a suitable operating rod 58. Pivoted on the upright portion 36 of the bracket 34 by means of an extension 59 thereof as indicated at 60. is a catch or drop latch 61 having an extension 62 adapted to engage in the notch or groove 44 in the rod 39, and the free end of thelatter has an angular forward extension or detent 63 projecting down'in position to engage any one of a series, preferably 4 arms on a toothed or star wheel 64 which is pivoted or rotatably mounted on the edge of the up right portion 36 of the bracket 34 as indicated at 65. The ends of the arms or wheel are all beveled in position to intercept the arms of the star lock nut 42 so as p wheel ,64 and norm passing.

egz zm '5 In the operation ot'the device as described,

the train. linefpipe 1. is normally under about pounds pressure and in order to' cjherge the auxiliary .zreservo'ir 4:; the engineer ch rg lt e ma l R ps V1 wit $1 9k PE sure" andthe triple valve? will .adinit sueh pressure through .the quick acting sliele mechanism incorporated therein. .Ilhispressure passes through;thetriple va lveinto the aux liary reservoir and n order-to util ze this reserve YO pounds'pressurejonputting on, the brakes, it isneeessary for the engineer 'toreduee his tram line pressure to 50 pounds.

This induces the triple valve to function in such manner as to adririt-jthis .ZOfpoundsthrough the proper ehannels land duets fend through the nductionpipes 7v mtothe brake cylinder pushing the piston. head ifi' land rod 10 against the pressure ofthe spring 13, forcingithe brakes against-the wheels in the usual*nianner. ,In this p0sition,jt he will also be moved With the pisten rod allow the spring" flOto expand eneeptlthat itis normellyheld' againstthe expansion by the detent 6,3 engagingthe fstarwvheel arm in position therebeneat-h hile the ,beu crank 25 is also lield against movement.

f ceurse, thejpressure in the train enter the pipe 22- and iorce the iston 23 forwardly-against theac'tion of t e spring '24, thus,movingthe-p'ismn rod forwardly in the manner shown in Figure l :the drawing to,-hol d the device 11I1"t l' l1S PO$l t1OI1 with the fspringAO contraeted -vvherelo y the valve 50 will remain closed owing to the toggle mechanism relieving the upper end oi ithe stem 54- oiithe valve hflgfrom-pressure thereon 7 In order to release the pressure from be hind the brake piston 9 and to release or. retract thebrakes, and the 'brakepressure, the engineer subjects the train;li.ne;pi'pe 1 to pounds pressure. 'Atthis stagethetriple valve has such a disposition that does not admit such pressure intofthe'. reservoir ,4,

butthetriple valve is'provided W1: th an exhaust-portB as previously described for-re leasing this pressure'and in case this triple valve mechanism should stick asit hap'pens sometimes, the elements heretofore described in connection with the releasingpistonand valve 48, will function under 90 pounds pressure as shown passing through the pipe22 to actuate the: piston '23 gagainst the" action of the spring 245m operate the trip.-0r 25 and star Wheel 6i, t0 release the detent 63 and permit the spring ;4 0;t1o ;be released whereby the valve; 50" will be unse'ated there' by bleeding the air pressure positively from the bra (Q'CYllIlClBZ 5 and the aujxihar-yreservorr 1 the releasing of the air .n the reservoir l-"directly through the valve 50 permitting the-triple valve 3Lt0 move to r'eleasedposial ),tpreve i hempirq t q Wh mt b qk yl de 5 willr greto sey, atythisstage;'there'vvoiildg be acorn-i r m n e t en: frq f jt e' k t i i h is th -ein iictien P n I' 1 th t i is po th itripleva v e i Wfll then actjto iInOYB the piston- Z9 forwardly it le s l h ab eke i l feiiel le il ifi I2 m ving :n t i h .op v e r det n g t rod f pleneer. 3 an m re th Ste ward yiageins t ae i ith srringflit again reset thetripping mechenism and release the valve'ififl, by I reason ig fft'he toggle '.mech nis n forms y th ilink #5 nd 1 whereby further escepe ofair pressure ,from th la xil a prevent d a dfli de i e's hi ipo itio ifm :a t i p at ,AW e S met d f; d y, t e no c Atwil a be ini'posit q t b ngag :by; t e tt 1 r1;t e de e 63 will be in position toiengage over one of r f th a i iheelfii Wh lefl the positio t b t rcep d by I y l eiini the cletent 63', thereby restraining the mechayite s een-s the triple valve the spring "'13 ry reservolr a ntl cylinder will fbe nisrn ,irorn further foperetionjuntil the brakes ar se -and r 'as already described, V I l th form ofrthe nven q sho [i FiguresA to 8. i nc;h sive, the structure is supported from th car frame int-he same man- J Q lQlUdl lgit b1=ake i o uppe ti the air reservoirzindbrqk cylinder butgin elea d in; h am om n e lieuof the tripping mechanism and mea nsfor I b y nd an e l rg m n 7 .70 the p s n r d- ZOO [Ilhe arm or .push rod 30 isalso provide d" in the same mann'enbut in lieu of thebraeket 36, lbr c e fi 1S pr vld dhev h a gu s e .72 w an p -11mg T re a u or o her pe yg nel 'ires h e'ct 'on,ith ei r ceiving a ro d '14 of corresponding cross-secti n whieh i elm d -S-"i diQa ed 7 4.0 a rod :76 onfvvhich the spring AOis mounted i t e msnn Z lhe e efe de ag ins .on d."9 h I.b fl9k .13 a an ,"Q lI IgQIlQQ .Q HWWW 4. r ta ee by i ll xi zfi lh opp s t e d Mimi/t e remity e ,P Y od 3 T e i e ehg a en 12 o t v T i T6 ihes a r 1 ettem .i' ee Wa d the pp sit r f s pi.

tau

' the sleeve or guide member pivoted transversely through an aperture 79 a recess '77 and permit of the rod 74 and in thisposition,

J the-valve 50 to seat.

otally ating the valve stem 50 in the same manner as previously described beyond the end of 72. A pin 78 is in the bracket 36' and sleeve 72 so as to intercept the recess 77 at times and has a centralportion of a length slightly greater than the width of rod 7% cut out as indicated at 80 through one-half ofits diameter and one end is provided with a'pinion 81 while the opposite end is retained by a washer 82 are a nut 83 to prevent displacement of the pin or shaft of the pinion which latter is in position to normally mesh with the upward ly facing teethof the rack bar. 70. In one position, the portion posed in the lower portion of the guide 72 soas not to project into the semi-circular free sliding movement the spring 40 is allowed to act for the purpose 'of moving the rod 74 to the right when the brakes are applied by movement of the piston 9 under action of pressure against the spring 13 so as to remove the end of the push rod 7 or arm awayfrom the nut 4-2 in the same manner as previously described, and as shown in connection with the present form in Figure 7 of the drawing. However, when the brakes are released the piston 23 is moved forwardly from the position shown in Figure 7 to the position shown in Figure 6, when the rod 74 will be shifted to permit The push rod or arm 30 moving forwardly to compress the spring and permitting the part 84 of the pin of the locking and releasing device to move into the recess 77 and thus hold said parts against movement. Of course, the tripping mechanism is actuated upon the piston 23 being moved by the pressure in the release cylinder 19 admitted'therethrough through the extension or second cross-over pipe 22 from the main airline or train pipe 1 which moves theportion 84 of the pin into the recess 85 in the guide 72. At the same time, the spring 13 will act to move the push rod or arm 30 against the nut 42 or adjacent thereto and the operation. as regards the changes in pressure is the same as previously described.

It will. thus be seenthat this mechanism will be placed on every car and by its automatic operation, will eliminate the old method'of having a brake and a man to release the brakes on each car and inspect each car to see that the brakes are set or released.

7 While I have described and shown my invention in what I consider to be the preferred form, it is to be understood that various changes in the form, arrangement and construction of the parts may be resorted to without departing from the spirit and scope of the invention and the principles connected to the toggle member oper make such brake systems, and auxiliary reservoir, a

e a piston slidable 84 of the pin 78 is dis-" involved in its construction and method of and that I reserve the right'to changes as shall fallwithin the scope of the device as claimed. I claim: I 1. In an automatic releasingvalve for air cylinder, a cross-over pipe connected therewith, a triple valve connected with said. pipe, in said cylinder and adapted for connection with a brake beam, an extension pipe connect-ed with said reservoir through said triple valve, valve mounted on the reservoir,

operation said valve being normally seated, and airactuated means for opening said valve when the brake beam is set, and to release said valve when the brake beam is released.

2. In an automatic releasing valve for air brake systems, an auxiliary reservoir, a cylinder, a cross-over pipe connected therewith, a triple valve. connected with said pipe, a piston slidable in said cylinder and adapted for connection with a brake beam, another cross-over pipe connected with said reservoir through said triple valve, a release valve mounted on the reservoir, said valve being normally seated, tripping mechanism connected with said relief valve for. permitting the same to remain in a seated postion, and releasing means actuated by air pressure from the main line of the braking system for releasing said tripping mechanism and.

relief valve.

3. An automatic releasing valve for air brake systems comprising an auxiliary reservoir, a cylinder, a cross-over pipe connected with the air line of the system, a triple valve connected with said pipe, said triple valve having communication with the cylinder through the reservoir, a piston slidable in said cylinder and adapted for connection with a brake beam, an extension pipeconnected with the air line, a cylinder connected with said extension pipe, a piston operating in said cylinder, a relief valve on the reservoir, a rod slidably guided and connected to open said relief valve and in one position to permit'the same to'be seated in another position, means cooperating between said rod and the piston rod of the last named piston a release to hold said rod against movement whenthe relief valve is open and actuated by pressure from the air line through the extension pipe and movement of the piston in the cylinder to which the extension pipe leads for releasing the same whereby the relief valve may be opened.

4:. An automaticreleasing valvefor air brake systems comprising voir, a cylinder, across-over pipe connected with the air line of the system, valve connected with said pipe, said triple valve having communication with the c linder through the reservoir,

an auxiliary r'eser- 1 a triple a piston slirahle in saidcylinder andadap'ted'for'fcoiiiiection holdingifthe ro'd in-"a iele-aeing posit-ion; withabrake beam,-

-an extension pipe;con--- meanfsfor li'olding said rodinythe last n'amed' nected with the air -l ine, -a' cylinder con-:1 position,- and releasing means for said holdnectedwithisaid extension 'pipie," a piston ing' nieans actuatedjby' the piston rod-of'the 5 operatinginsaid cylinder, a reliefvalveoncylinder to which theextension pipe 'con-wm the reservoir, a rod slidably' guided andcone; ne'cts wherebysaid spring maybe expanded:

nected to open saidrelief valve and in onel for ui'ise ating the'reliefvalve for releasingposition to--perniitthe same'toi beseated the 'brakes when the bra-keheain is set and means cooperating b'etween said rod and the tor l e ea; "valve-when'the brake beam is piston rod of the last named p-istonto holdreleased-find pueh rod connectedivith' the said rod against 1novemen-t when thereliiefl bli'ak'e" beam p'iStOn' rod and movable therevalve isopen and actuated by-pressure from With-adjacent the springactuated rod-to the air line through the extension pipeiangi compress the spring thereof when the relief movement of thepiston inth'e cylindei to valveis released to-seah U 15 which the extension pipe leads for releasing An-automaticreleasing valve for air thesame whereby "the reliefval-ve may-be brakes y's tems coniprising an auxiliary i'es er- OpenecL-anda spring for-actuating 'said rod, voi r andcylindeig' a cross-overpipe;con the piston in the first named-cylinderthaw nected' therewith, atriple valve connected ing a push rod adapted-to.engage' saidtrip} with ,said pipe, a piston opera-blein ;said 0 rod. for compressing the springxwhen the cylinderand adapted for-connection with'a 35 device is set t brake beam, anextension pipe connected-to 5.,-An automatic :releasing valve for air the air linen-f the-system, azeylinder com brake systems comprising aniauxiiiary.reser m-unicating'with said pipe and'having 'a pise voir and cylinder, a crossoverxpipe con tonoperating' therein with its-piston rod-- nected therewith, a triplevalve eonnected projectingforwardly 'frompne iid of the with said pipe, a piston a operable in" said cylinder,a relief valve on the-an; iliary reser-h cylinder and. adapted for connection with a voir, a guide mounted over ,the"reservoir, a r. hralte beam,an extensionpipe connectedtorod slidable in saith-guide and-having-a the air line of: the system-,na cylinder co ntoggle connection withtl ie relief valve,ja- 3U municating. with said. pipei and-ihaving a springf holding-' said: rod projected inuoner piston operatingthereinwith its piston rodpo'sitionr-and adapted -to-be Compressed fol projectingforwardly fromone:en dirof the .holding the rod inf a releasing:positionp cylinder, a. relief valve on the lauxiliaryresei means for holding saidrod in the'last named voir, a guide ,mounted over-the reservoir, position,"and releasing means-for=said hold; a rod slidable. insaid guide and havingf a infim gm' t t d b ith i di V toggle connection wvith atheu relief valve/ an cylinder to -which-the extension pipe con' spring hoidin'g saidrod projected i-in; one; nects whereby said epliiig may'ibe expanded position and adapted to. becompressedqfor to-unseatythe"relief kvalvefor releasing the hoiding thenrodi.i11\. a-;;releasing' positiom-nbrak'es when thehr'a kej beam isset and to means for holding said rod ini-thelast named= close -said valve when the brake, beam is re} 4 5 position, and releasing means .fonEsaid hold -leased, and a piish'=rod= connected with gt-he" ing means actuated bythe -piston' rodyof the, brake beam piston -rod aiid movable there cylinder to whichathe extension pipe ;con,--ii i-th adjacent the sp ri'ng-actuated rod' to n c s whereby said, springmaybeexpanded' compres'sthespring thereof whe'n" therel'iefw- 45 lvuns ating the relief.;valve for rele singigivalvevis releasedgto seat;ithe releasing pistoir z the brakes when. the, brakeiheamnsiset .aibeing moved to set the trip by a spring to close said valve when the brake beam h edi'i th i lind zth f;

ls releasedv V i r 1g 1 s8i vAn aut-omatic,releasing valve for air 6. Air automatic lfeleasuig valve for air brake s stems comprising an auxiliary rser- 50 brakesystem comprising an auxiliary reservoir and cylinder, a cross-over pipe, conv01r and cylinder, a cross-over pipe, connected therewith a triple valve connected nected therewith a triple valve connected with said pipe, a piston operable in said with said plpe, a piston operable in said cylinder, a brake beam connected with said cylinder and adapted forconnectlon wlt-h a piston, an extension pipe connected to the air 55 brake beam, an extension pipe connected't line of the system, a cylinder communicating the air line of the system, a cylinder comwith said pipe and having a piston operatmunicating with said pipe and having a ing'therein with its piston rod projecting piston operating therein with its piston'rod forwardly from one end of the cylinder, a projecting forwardly from one end of'the relief valve on the auxiliary reservoir, a

;0 cylinder, a relief Valve on the auxiliary guide mounted over the reservoir, a rod reservoir, a guide mounted over the reserslidable in said guide and having a toggle voir, a rod slidable in said guide and having connection with the relief valve, a spring a toggle connection with the relief valve, a holding said rod projected in one position holding said rod in the last named position,

' and releasing means for said holding means actuated by the piston rod of the cylinder to which the extension pipe connects whereby said spring may be'expanded for unseating the relief valve for releasing the brakes when the brake beam is set and to close said valve when the brake beam is released and a push rod connected with the brake beam piston rod and movable therewith adjacentthe spring actuated rod to compress the spring thereof when the relief valve is released to seat, the releasing piston being moved in one direction under spring action and the tripping mechanism including a toothed wheel, a detent and a spring actuated catch adapted to engage and hold the same in one position and to release same in another position.

9. In an air brake system the combination of an auxiliary reservoir,,a brake cylinder, a train pipe and triple valve, there be ing a duct connecting the triple valve with a brake cylinder and the brake cylinder with the train pipe through said valve, said brake cylinder having its piston set in an unbraked position under spring pressure; of a relief valve associated with the auxiliary reservoir, a cross-over pipe connecting the train pipe with the triple valve, a push rod movable with the brake cylinder piston. spring actuated tripping mechanism connected to actuate the relief valve and adapted to be engaged by thepush rod for setting the same,

and another cross-over pipe connected with the train line for releasing the tripping mechanism under air pressure.

10. In an air brake system the combination of an auxiliary reservoir, a brake cylinder, a train pipe andatriple valve, there being a duct connecting the triple valve with a brake cylinder and the brake cylinder with the train pipe through said valve, said brake cylinder having its piston set in an unbraked osition under spring pressure; of a relief valve associated with the auviliary reservoir, a cross-over pipe with the triple valve, a push rod movable with, the brake cylinder piston, springact-umechanism and releasing the same to connecting the train pipe ated tripping mechanism connected to actuate the relief valve and adapted to be en gaged by the push rod for setting the same, another cross-over pipe connected to the train line pipe, a release cylinder, a piston operating therein and having its rod pro jecting therefrom, means carried by the rod for en a in the tr1 3m inechamsm and D b O 1 releasing the same topermit the actuating means of the relief valve to'unseat the same,

said device being actuated upon the pressure in the train lme being reduced below that for applying the brakes through operation 11. In an air brake system the combina tion of an auxiliary reservoir, a brake cylinder, a train pipe and triple valve, there being a duct connecting the triple valve with a brake cylinder and the brake cylinder with the train pipe through said valve, said brake cylinder having its piston set in an unbraked position under spring pressure; of a release valve associated with the auxiliary reservior, a cross-over pipe connecting the train pipe with the triple valve, a push rod movable with the brake cylinder piston, spring actuated nected to. vactuate the release valve and adapted to be engaged by the push rod for setting the same, another cross-over pipe connected to the train line pipe, a release cylinder, a piston operating therein and having its rod projecting therefrom, means car ried by the rod for engaging the tripping permit the actuating means of therelease valve to unseat the same.

tripping mechanism con- U I LEONARD QUATES. 

